Download iOS 10.2.1 (14D27) for iPhone 6s

You will have to note that you can only restore signed IPSW firmware files using iTunes or 3utools.

❌ This IPSW firmware is not being Signed by Apple

Firmware Identifier iPhone8,1
iOS Version 10.2.1
Release Date 2017-01-23
Update Date 2017-01-13
Sha1sum
41e5be8034576b1edaaeab0e05cf789d12eb76df
Sha256sum
17d3e82585b6202d73e3cbe0624c9f73844de65e77b3145383b51b70da7747e9
md5sum
f1d463a0bad9d718938d66d961c9d69e
Size 2.34 GB
FileName
iPhone_4.7_10.2.1_14D27_Restore.ipsw
Status

Download IPSW (2.34GB) Check device info
Release Notes

It should be noted that these are the official release notes for the from Apple

iOS 10.2.1 includes bug fixes and improves the security of your iPhone or iPad.

It also improves power management during peak workloads to avoid unexpected shutdowns on iPhone.

For information on the security content of Apple software updates, please visit this website:

https://support.apple.com/HT201222